Member End Fixities control whether a member is connected as a pin, fixed or spring
- X Displacement
- Y Displacement
- Z Displacement
- X Rotation
- Y Rotation
- Z Rotation
So for instance, a rigid connection between two members (i.e. any forces or moments are transferred from one member to the next) will be denoted as ‘FFFFFF’ whereas a hinge connection (which which cannot transfer moments in the Z direction) would be coded as ‘FFFFFR’.
“Frames” have a fully fixed, rigid connection specified by a fixity code of ‘FFFFFF’. “Trusses” have a hinged connection denoted by a code of ‘FFFFFR’. To specify custom values, ensure that the “Custom” button is selected.
For more information on member fixities, SkyCiv has a technical article (including a video) in our blog, focussing on how to model member fixities.
Example: How to model pin connections or hinges
In this example we will create a simple pin connection, such as a hinge. Start by creating 3 nodes and joining them with 2 members. In this example node 2 will be the hinge.
For more information, SkyCiv has a further explanation on how to model a hinge, using Structural Analysis Software.